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So on my first casing that was PF cakes( Malabars)crumbled with 60/40 casing layer. anyways I had a couple shrooms accidently grow down under the casing layer because some light was exposed to the side of my clear container. I easily got them out though with no rotting or contaminants, but i noticed that the mushrooms that grew underneath were significantly bigger than the rest. I figured it had something to do with the very small amount of light they recieved. So on my 2nd casing I gave it only like 3 hours of light a day and the actual size of the mushrooms were a lot bigger than from the first casing? So is there any correlation here? Do mushrooms grow faster or larger when they recieve less light and more dark-time?

After my pins have set I usually decrease light to about 4/6 hours a day. I also agree that this seems to speed up growth, although it's not a huge difference, It is noticable. I haven't noticed a difference in size from this though.

Likely because the short light cycle tends to emulate very late fall or early winter (very short days), so they are probably trying to muscle up and fruit large so there are more spores for procreation next spring. Moreso anyway than the other fruiting triggers (temps, humidity, oxygen).